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- Centre National de la Recherche ScientifiqueFR737 papers
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60 papers · 1 filter
Observations and modeling of the inner disk region of T Tauri stars
R. L. Akeson, C. H. Walker, K. Wood +7
We present observations of four T Tauri stars using long baseline infrared interferometry from the Palomar Testbed Interferometer. The target sources, T Tau N, SU Aur, RY Tau and D…
Coronal Seismology and the Propagation of Acoustic Waves Along Coronal Loops
J. A. Klimchuk, S. E. M. Tanner, I. De Moortel
We use a combination of analytical theory, numerical simulation, and data analysis to study the propagation of acoustic waves along coronal loops. We show that the intensity pertur…
Instabilities and the roton spectrum of a quasi-1D Bose-Einstein condensed gas with dipole-dipole interactions
Stefano Giovanazzi, Duncan H J O'Dell
We point out the possibility of having a roton-type excitation spectrum in a quasi-1D Bose-Einstein condensate with dipole-dipole interactions. Normally such a system is quite unst…
Inferring coronal structure from X-ray lightcurves and Doppler shifts: a Chandra study of AB Doradus
G. A. J. Hussain, N. S. Brickhouse, A. K. Dupree +6
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88 ksec (1.98 Prot) in 2002 December with the LETG/HRC-S. The X-ray ligh…
Hawking radiation in sonic black holes
S. Giovanazzi
I present a microscopic description of Hawking radiation in sonic black holes. A one-dimensional Fermi-degenerate liquid squeezed by a smooth barrier forms a transonic flow, a soni…
A simple proof of a theorem of Karrass and Solitar
Delaram Kahrobaei
In this note we give a particularly short and simple proof of the following theorem of Karrass and Solitar. Let be a finitely generated subgroup of a free group with infini…